Python type transmission example

#!/usr/bin/env python


class MathOperator(object):
    def __init__(self, name):
        self.result = 0
        print(name)

    def work(self, a, b): pass

    def get(self): return self.result


class OperationSum(MathOperator):

    def __init__(self): super(OperationSum, self).__init__('OperationSum')

    def work(self, a, b): self.result = a + b


class OperationMult(MathOperator):

    def __init__(self): super(OperationMult, self).__init__('OperationMult')

    def work(self, a, b): self.result = a * b


class Executor(object):

    def __init__(self, _type):
        self.operator = _type()

    def pr(self, a, b):
        self.operator.work(a, b)
        print(str(self.operator.get()))


e1 = Executor(OperationSum)
e1.pr(5, 6)

e2 = Executor(OperationMult)
e2.pr(5, 6)